-
Notifications
You must be signed in to change notification settings - Fork 0
/
mysqlsplit.go
190 lines (174 loc) · 4.42 KB
/
mysqlsplit.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
package main
import (
"bufio"
"compress/gzip"
"fmt"
"github.com/urfave/cli"
// "fmt"
"github.com/op/go-logging"
"io"
"net/http"
_ "net/http/pprof"
"os"
"regexp"
"strings"
"sync"
)
var version string
var log = logging.MustGetLogger("main")
var debug = false
var compress = true
var stdout_log_format = logging.MustStringFormatter("%{color:bold}%{time:2006-01-02T15:04:05.0000Z-07:00}%{color:reset}%{color} [%{level:.1s}] %{color:reset}%{shortpkg}[%{longfunc}] %{message}")
var reExtractTableName = regexp.MustCompile("^-- Table structure for table `(.*)`")
func main() {
app := cli.NewApp()
app.Flags = []cli.Flag{
cli.BoolFlag{
Name: "debug",
Usage: "enables debug",
Destination: &debug,
},
cli.BoolTFlag{
Name: "add-check-off-prefix",
Usage: "disables foreign key checks on load (enabled by default)",
},
cli.BoolTFlag{
Name: "add-check-on-suffix",
Usage: "enables foreign key checks on end of file (enabled by default)",
},
cli.BoolTFlag{
Name: "compress",
Usage: "compress the data",
Destination: &compress,
},
}
app.Action = func(c *cli.Context) error {
mysqlsplit(c)
return nil
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}
func mysqlsplit(c *cli.Context) {
stderrBackend := logging.NewLogBackend(os.Stderr, "", 0)
stderrFormatter := logging.NewBackendFormatter(stderrBackend, stdout_log_format)
logging.SetBackend(stderrFormatter)
logging.SetFormatter(stdout_log_format)
if debug {
go func() {
log.Warningf("Starting profiler at localhost:6060")
log.Errorf("error running profiler: %s", http.ListenAndServe("localhost:6060", nil))
}()
}
log.Info("Starting split from stdin, outdir is out/")
log.Debugf("version: %s", version)
tables := make(map[string]chan *string)
prefix := []string{
"# START\n",
"SET AUTOCOMMIT = 0;\n",
}
postfix := []string{"# END\n"}
if c.BoolT("add-check-off-prefix") {
prefix = append(prefix,
"SET FOREIGN_KEY_CHECKS = 0;\n",
"SET UNIQUE_CHECKS = 0;\n",
)
}
if c.BoolT("add-check-on-suffix") {
postfix = append(postfix,
"SET UNIQUE_CHECKS = 1;\n",
"SET FOREIGN_KEY_CHECKS = 1;\n",
)
}
postfix = append(postfix, "COMMIT;\n")
os.Mkdir(`out`, 0755)
stdin := bufio.NewReader(os.Stdin)
tablesStarted := false
currentTable := ""
// sync workers by waitgroup
var wgEnd sync.WaitGroup
// bufio.Scanner doesnt dynamically allocate buffers so it is useless for long lines
for {
line, readErr := stdin.ReadString('\n')
if strings.HasPrefix(line, `-- Table structure`) {
match := reExtractTableName.FindStringSubmatch(line)
if len(match) > 1 {
tableName := match[1]
if len(currentTable) > 0 {
for _, l := range postfix {
str := l
tables[currentTable] <- &str
}
close(tables[currentTable])
delete(tables, currentTable)
}
currentTable = tableName
tablesStarted = true
if compress {
tables[tableName] = FileWriter("out/"+tableName+".sql.gz", &wgEnd)
} else {
tables[tableName] = FileWriter("out/"+tableName+".sql", &wgEnd)
}
for _, l := range prefix {
str := l
tables[tableName] <- &str
}
log.Noticef("Found table %s\n", tableName)
} else {
log.Warningf("Failed to match %20s", line)
}
}
if tablesStarted {
tables[currentTable] <- &line
} else {
prefix = append(prefix, line)
}
if readErr == io.EOF {
break
} else if readErr != nil {
log.Errorf("Read error: %s", readErr)
break
}
}
// close off remaining tables
log.Warning("waiting for workers to close")
for k, v := range tables {
log.Warningf("Closing %s", k)
close(v)
delete(tables, k)
}
// wait till stuff is actually saved and closed
wgEnd.Wait()
}
func FileWriter(name string, wg *sync.WaitGroup) chan *string {
ch := make(chan *string, 128)
go func(f string, ch chan *string) {
wg.Add(1)
// set to done once we ended so app can wait for all files to be saved
defer wg.Done()
log.Noticef("Starting write to %s", name)
file, err := os.Create(name)
if err != nil {
log.Errorf("file open error %s:%s", name, err)
}
if compress {
gzw := gzip.NewWriter(file)
for line := range ch {
gzw.Write([]byte(*line))
}
gzw.Close()
} else {
for line := range ch {
_, err := file.Write([]byte(*line))
if err != nil {
panic(fmt.Sprintf("error writing %s: %s", name, err))
}
}
}
log.Noticef("Closing %s", name)
file.Close()
}(name, ch)
return ch
}